For quit to menu skips (Canals, 3A-C, Ch7, 8b elevator, Ventrium, Bev, last cutscene) we need the checkpoint icons to appear to accurately pause and quit out. [The rest of the checkpoints can be edited in during post-production, so don't worry about those].

I've compiled a list of checkpoint bindings you can use. Got these from nulad's pastebin (here: http://pastebin.com/wNzxR0By). So you don't need to start a new game and then play all the way to chapter 8 or whatever just to get the checkpoint icon you want to appear.